Chronic bronchitis is usually defined as cough and sputum on most days for at least three months of the year in more than two successive years in the absence of any other cause (e.g. bronchiectasis). This definition is wide and does not imply infection or airflow obstruction. Three abnormalities occur in the disease:
Hypersecretion of mucus.
Infection resulting in purulent sputum.
KeywordsInfluenza Smoke Prednisone Dextran Digoxin
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